Athermal Lens Mount Design Tutorial Using ZEMAX and Solidworks
Explore the detailed guide on designing an athermal lens mount to compensate for defocus due to temperature changes in a Space Environment using ZEMAX and Solidworks. The tutorial covers the design process, material properties, configuration adjustments, and more in the context of a Remote Sensing Infrared Optical System.
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A tutorial on the use of ZEMAX and Solidworks in athermal lens mount design By James Champagne OPTI 521 Optomechanical Engineering Fall 2010
Goal is to design a lens mount to compensate defocus caused by temperature changes Space Environment (Assume T = 60 C) Remote Sensing Infrared Optical System ZEMAX Solidworks
75 mm F/3 Double Gauss 3-5 m Wavelengths 20 Degree Full Field of View
AMTIR1 (Amorphous) Dn/dT = 72 ppm/C IRG100 (Chalcogenide) Dn/dT = 103 ppm/C = 15 ppm/C n = 2.621 CaF2 Dn/dT = -10.4 ppm/C = 18.4 ppm/C n = 1.410 MgF2 Dn/dT = 0.88 ppm/C = 9.4 ppm/C n = 1.349 BaF2 Dn/dT = -16 ppm/C = 18.4 ppm/C n = 1.457 = 12 ppm/C n = 2.515
-Scroll to right side of Lens Data Editor -Enter CTE data of lens mount in airspaces -Al 2024 = 22.9 ppm/C
-Open Multi-Configuration Editor -Make Thermal under Tools
-Choose number of configurations -Temperature range from 0 C to 60 C
-Lens Data Editor at 0 C and 0 atm pressure -Optimize BFL for minimum RMS spot radius -New BFL = 0.4995 inches
-Repeat and choose Config 4 for 60 C and 0 atm pressure -Lens Data Editor now at 60 C and 0 atm pressure -Optimize BFL for minimum RMS spot radius -New BFL = 0.4959 inches
The change in BFL between 0 C and 60 C is: 0.0036 inches = 91 m Focus moves towards lens for increase in T
Lens/Detector interface mount must move detector plane towards lens for increase in temperature High-Expansion material Al 6061 Low-Expansion material Invar 36
Bi-metallic lens mount to compensate defocus Infrared optical system in space environment Warnings dn/dT and not constant over large T Check data input of ZEMAX
Friedman, I., Thermo-optical analysis of two long-focal- length aerial reconnaissance lenses, Opt. Eng. 20, 1981:161. Vukobratovich, D, Introduction To Opto-Mechanical Design, Raytheon Systems Co., Tucson, AZ. Yoder, P.R., Jr., Mounting Optics in Optical Instruments, SPIE Press, Bellingham, WA, 2008. Zemax Corporations. Zemax Optical Design User s Manual. Chapter 19: Thermal Analysis (April 2010). Zemax Knowledge Base. 2010. http://www.zemax.com/kb/categories/Thermal- Analysis/
